For your case regarding using 'anonymous' user, in Joget's perspective, there is no unique information to identify your users. 

I need more information on how your app works. Like, what is the procedure, how do you track progress for each potential employee, whether they practice Joget app building on their own local machine or on a shared server, and so forth.

On the other hand, you can check out Joget Academy to allow your potential employees to self-learn. Once they have completed the courses, they will receive a course completion certificate. Recently, the Joget team has also publicly released their new Joget App Designer Certification program. This may simplify your onboarding process for your users.

Cheers.

Actually, I forgot to mention that on the very first step, I get their unique IP: email.... There must be a way to send the link to the correct entry by email (I just clicked to the title of this thread in my email and it opened this page) 

How do I achieve this functionality? Is there a hash tag to use?

Thanks

Your case requires a customized solution.

Perhaps you can have a look at the User Notification plugin. Basically, this plugin is an automated email tool that sends out email for every task assignment with the option to append any parameter to the URL, to be embedded into the email accordingly to the correct users. You may need to modify the plugin for your use case.

Since this plugin is available in community edition so you can modify the source codes according to your requirement: https://github.com/jogetworkflow/jw-community/blob/6.0-SNAPSHOT/wflow-core/src/main/java/org/joget/apps/app/lib/UserNotificationAuditTrail.java

Hi, you could use either the https://dev.joget.org/community/display/KBv6/Hash+Variable#HashVariable-UserHashVariable or https://dev.joget.org/community/display/KBv6/Hash+Variable#HashVariable-FormDataHashVariable